zero(7) [hpux man page]

zero(7) 						 Miscellaneous Information Manual						   zero(7)

NAME

       zero - /dev/zero special file

DESCRIPTION

       is a zero special file.	Reads from a zero special file always return characters whose value is 0 ( characters).

       Data written on a zero special file is discarded or ignored.

       Seeks on a zero special file always succeed.

       When  is  memory  mapped  by calling the associated memory object behaves as a object. It is initialized to all zeros. Writes to the object
       modify the contents of the object which are observed by subsequent reads to this object.

       Both and are allowed.

       When it is mapped shared, the memory object can be shared only with the descendants of the  current  process.  Modifications  made  to  the
       object are visible only to the process and its descendants.

       When it is mapped private, any modifications done after are visible only to the process.

EXAMPLES

       In the following example, the buffer is filled with  characters.

       In the following example, the process now has a range of  characters at memory location

FILES

SEE ALSO

       mmap(2), null(7).

																	   zero(7)

shm_unlink(3)						     Library Functions Manual						     shm_unlink(3)

NAME

       shm_unlink - Removes a shared memory object created by a call to the shm_open function (P1003.1b)

LIBRARY

       Realtime Library (librt.so, librt.a)

SYNOPSIS

       #include <sys/mman.h>

       int shm_unlink (
       const char *name);

PARAMETERS

       *name   Points to the name of the shared memory object.

DESCRIPTION

       The  shm_unlink	function  removes the name of the shared memory object pointed to by name.  If this file descriptor is used by other func-
       tions, all references to the shared memory object are removed, but content removal is delayed until all open and mapped references  to  the
       shared memory object are removed.

RETURN VALUES

       On a successful call to the shm_unlink function, a value of 0 (zero) is returned.  Otherwise, a value of -1 is returned and errno is set to
       indicate the error.

ERRORS

       The shm_unlink function fails under the following conditions:

       [EACCES] 	   Permission to unlink the shared memory object is denied.

       [ENAMETOOLONG]	   The length of the name argument exceeds PATH_MAX, or a pathname component is longer than NAME_MAX while _POSIX_NO_TRUNC
			   is in effect.

       [ENOENT] 	   The named shared memory object does not exist.

RELATED INFORMATION

       Functions: close(2), mmap(2), munmap(2), shm_open(3)

       Guide to Realtime Programming delim off

																     shm_unlink(3)